Nope I haven't heard them. I was just thinking, while all other product renewed, why not 5BA? Also since that one is the top point in silicone shells, I was thinking maybe I would go for it, since I am in love with my SE5way and silicone earpieces advantages like comfort and isolation.
As i recall it, the Heir 5.0 was one of the later, if not the last of the designs he did under the Heir brand. Maybe he just didn't find it neccesary to make further improvements to the design? I must admit i am a little curious too though.